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Home Small, blocky shapes of towns, fields, and pastures surround the meandering Mississippi River, the largest river system in North America in this Landsat image. (NASA’s Goddard Space Flight Center/USGS) Small, blocky shapes of towns, fields, and pastures surround the meandering Mississippi River, the largest river system in North America in this Landsat image. (NASA's Goddard Space Flight Center/USGS)

Small, blocky shapes of towns, fields, and pastures surround the meandering Mississippi River, the largest river system in North America in this Landsat image. (NASA’s Goddard Space Flight Center/USGS)

Small, blocky shapes of towns, fields, and pastures surround the meandering Mississippi River, the largest river system in North America in this Landsat image. (NASA's Goddard Space Flight Center/USGS)

Small, blocky shapes of towns, fields, and pastures surround the meandering Mississippi River, the largest river system in North America in this Landsat image. (NASA’s Goddard Space Flight Center/USGS)

This image shows the ECOSTRESS land surface temperature variations measured on May 22, 2020, during the full lockdown period over an area centered on the Great Mall in Milpitas. The blue dots represent ground truth measurements on May 22 in large vacant parking lots. The darkish reddish shades show the highest temperatures on dark asphalt parking lots and roadways, and the yellow-greenish shades indicate lower temperatures in parklands and semi-vegetated areas. Bright white rooftops are in the middle shades. (Christopher Potter, NASA Ames Research Center)